<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>data测试</title>
    <script src="https://unpkg.com/vue@3/dist/vue.global.js"></script>
</head>
<body>

<div id="app">
    <button v-on:click="count++">
        Count is: {{ count }}
    </button>
</div>

<script>
    const {createApp, ref} = Vue
</script>
</body>
</html>